<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        :show-icon="true"
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row style="margin-top: 15px; margin-bottom: 15px">
        <el-col>
          <span>选择商品分类：</span>

          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand" label="">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="item.id"
                  closable
                  @close="handleClose(i,scope.row)"
                  >{{ item }}</el-tag
                >
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="
                    showUpdateDialog(scope.row.attr_id, scope.row.attr_name)
                  "
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeById(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand" label="">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="item.id"
                  closable
                  @close="handleClose(i,scope.row)"
                  >{{ item }}</el-tag
                >
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="
                    showUpdateDialog(scope.row.attr_id, scope.row.attr_name)
                  "
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeById(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的弹出框 -->
    <el-dialog
      :title="titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed()"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams()">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的弹出框 -->
    <el-dialog
      :title="titleText"
      :visible.sync="updateDialogVisible"
      width="50%"
      @close="updateDialogClosed()"
    >
      <el-form
        :model="updateForm"
        :rules="updateFormRules"
        ref="updateFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="updateForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="updateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="updateParams()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      //   级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
      },

      //添加参数的表单数据
      addForm: {
        attr_name: '',
      },

      // 修改参数的表单数据
      updateForm: {
        attr_name: '',
        attrId: null,
      },

      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '动态参数不能为空', trigger: 'blur' },
        ],
      },

      // 修改表单的验证规则对象
      updateFormRules: {
        attr_name: [
          { required: true, message: '动态参数不能为空', trigger: 'blur' },
        ],
      },

      //  级联选择框双向绑定到的数组
      selectedKeys: [],

      //   被激活的页签的名称
      activeName: 'many',

      //   动态参数列表
      manyTableData: [],

      // 静态属性列表
      onlyTableData: [],

      // 展示添加参数的弹出框
      addDialogVisible: false,

      // 展示修改参数的弹出框
      updateDialogVisible: false,

      // 动态编辑标签的显示
      inputVisible: false,

      // 动态标签输入框
      inputValue: '',
    }
  },
  created() {
    this.getCateList()
  },

  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败')
      // 为商品分类列表赋值
      this.cateList = res.data
    },

    // 级联选择框选中项变化,会触发这个函数
    handleChange() {
      this.getParamsData()
    },

    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },

    // 获取参数列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // 根据所选分类的id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `/categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )
      if (res.meta.status !== 200)
        return this.$message.error('获取参数列表失败')

      //把每一项的字符串用空格分隔转换成数组
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },

    // 监听添加参数弹出框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },

    // 点击按钮，添加指定参数或属性
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.addDialogVisible = false
        this.getParamsData()
        this.$message.success('添加参数成功')
      })
    },

    // 点击按钮，展示修改参数的对话框
    showUpdateDialog(attr_id, attr_name) {
      this.updateForm.attr_name = attr_name
      this.updateForm.attrId = attr_id
      this.updateDialogVisible = true
    },

    // 监听修改参数弹出框的关闭事件
    updateDialogClosed() {
      this.$refs.updateFormRef.resetFields()
    },

    // 点击按钮，修改参数
    updateParams() {
      this.$refs.updateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.updateForm.attrId}`,
          {
            attr_name: this.updateForm.attr_name,
            attr_sel: this.activeName,
          }
        )

        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.getParamsData()
        this.updateDialogVisible = false
        this.$message.success('修改参数成功')
      })
    },

    // 点击按钮,根据参数id和属性id删除指定参数
    async removeById(attr_id) {
      const result = await this.$confirm(
        '此操作将永久删除该参数,是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((error) => error)

      if (result !== 'confirm') return this.$message.info('已取消删除')
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) return this.$message.error('删除参数失败')
      this.getParamsData()
      this.$message.success('删除参数成功')
    },
    // 点击按钮，显示隐藏动态编辑标签按钮，显示输入框
    showInput(row) {
      row.inputVisible = true

      // 点击按钮后直接获取焦点
      //$nextTick 方法的作用,就是当页面上元素重新被渲染之后，才会执行回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 动态标签按下enter或者失去焦点触发的事件
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //发起请求保存数据
      this.saveAttrVals(row)
    },

    async saveAttrVals(row){
      // 发起请求，保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '),
        }
      )
      if (res.meta.status !== 200) return this.$message.error('添加参数项失败')

      this.$message.success('修改参数项成功')
    },

    // 标签
    handleClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },

  computed: {
    //   如果按钮需要被禁用则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedKeys.length === 3) {
        return false
      } else {
        return true
      }
    },

    //   当前选中的三级分类的id
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      } else {
        return null
      }
    },

    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    },
  },
}
</script>

<style lang="less" scoped>
.el-tag {
  margin-right: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>